﻿using System;
using System.Web.UI;
using Xpedite.Extensions;
using Xpedite.Resources.Combiners;

/* Copyright (c) 2010 CBaxter
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), 
 * to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 
 * IN THE SOFTWARE. 
 */

namespace Xpedite.Resources.Definitions
{
  internal class CssDefinition : DefinitionBase
  {
    private static readonly INamingRule NamingRule = new NamingRule(NamingPattern.HtmlIdAttribute);
    private readonly IResourceUrlGenerator _urlGenerator;
    private readonly ICombinerFactory _combinerFactory;
    private readonly IResourceCache _resourceCache;

    public override ResourceType ResourceType { get { return ResourceType.Css; } }
    
    public CssDefinition(DefinitionArgs args, String referenceName)
      : base(args, referenceName, NamingRule)
    {
      Verify.NotNull(args, "args");
      
      _urlGenerator = args.UrlGenerator;
      _resourceCache = args.ResourceCache;
      _combinerFactory = args.CombinerFactory;
    }

    public override void EmitResource(HtmlTextWriter writer)
    {
      IResourceUrl virtualUrl = _urlGenerator.GenerateUrlFor(this);

      _resourceCache.GetOrCreateWithResourceDependencies(
        virtualUrl,
        () => _combinerFactory.CreateCssCombiner().Combine(virtualUrl, this),
        Resources
      );

      writer.RenderCssStyleSheetLink(virtualUrl);
    }
  }
}
